Hawk is here, yay!

[Megadan]

Going in today to my least favorite place on earth, the DMV. Time to register and title this guy so I can legally ride. Expect a lot of miles to rack up on this girl now lol.

[ben2go]

Nice job on the plug cap. It should be good for a long time.

I've never heard anyone say they enjoyed going to the DMV.

[Megadan]

Originally Posted by ben2go

Nice job on the plug cap. It should be good for a long time.

I've never heard anyone say they enjoyed going to the DMV.

It actually wasnt too bad this time around. Only a few people there. In and out in less than 20 minutes and she is legal now.

[hertz9753]

The day I went to get my title and registration Donald Trump was in Bismarck to give a speech in 2016. I walked in and saw lees than 10 people. Nobody was arguing about gross weight and net weight and why it increases the registration fee.

I have never understood why some people would use the chair to sit down and challenge something that they know is true with a DMV worker that can't haggle on price and waste other peoples time...

[pete]

The standard main in the TTR was a #148 30mm carb
with the 32mm Koso I'm running a #157..
not sure.. think it's got a #42 pilot .. standard was #40
needle... centre groove ?

but it's a bit lean on the pilot as it's rich on the main...
but the power jet takes care of that when you snap the
throttle open at low revs...

what I have found over the years to get the pilot right/close
if you can start a cold motor with out choke you are to
rich "big" on the pilot jet...

my bike is a dirt only so it not running at constant revs for
long periods " or even short periods "
so my jetting requirements will be a bit diffrent...



..

[Megadan]

Your method for determining pilot size is close to mine. I have always aimed to have a bike that will just barely try to start cold with no choke. That usually indicates to me that the idle mixture is set fairly close. From the size ranges you are describing, and the obvious differences in displacement power, and airflow between the TTR250 and the CG250 engines, I think a 40 pilot is a perfect starting point. Main jet, with all mods, minus the head work, I think a safe starting point would be a 140 would be a safe (likely rich) starting point.

I just got the carb in today. I must say, for the money, this is a rather well built carburetor. The idle mixture screw is an air metering type and the screw is on the left side as well as the idle speed screw, which is both thumb turn or flathead. The only thing in kind of an awkward place is the choke pull, which is also on the left side but is rather high up. It might be awkward to get to installed on the bike, so I may look into doing a simple choke cable setup for it.

Honestly, the only thing kind of less than spectacular with the quality is just the finish on it, which is just a bit discolored and dirty looking. Nothing a little time with some steel wool and WD40 couldn't fix. That said, the bore machining is beautiful. While I wait for my laundry I am going to take the carb apart and clean it really well and try to shine it up a bit.

Went ahead and ordered an intake for it as well as an angled Uni filter for now. I will try to sort out a better air filter/intake solution in the future, but this will get it up and running. I don't plan on crossing any bodies of water any time soon, so the pod filter will be fine. Likely I am going to find a piece of 2 inch aluminum mandrel tubing that will relocate the pod to where the airbox used to be, or mod the airbox so that the pod sits inside of it. I will cross that bridge when I get to it though.

I will say this, and I agree with Pete and his many assertions in other threads, the PWK/OKO/KOSO flat side carbs are going to definitely offer a performance increase over the VM26/PZ30. The lack of reduction down to 26mm like you find in the VM26 is going to make a big difference in airflow. The real question is, how much of a difference will it make.

[pete]

I got the one with the grey finish.....






..

[Megadan]

Also, I forgot to link the items.

Carburetor on Amazon.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

You can get this same carb on Aliexpress for about 5 bucks cheaper. I bought it from Amazon because I had the previously mentioned gift card balance to work with. The upside to Amazon was, that it qualifies under prime, so 2 day shipping for free. The only real difference is, the one on Amazon has different jet sizes in it.
That said - Aliexpress link https://www.aliexpress.com/item/KOSO...00023.6.zpsJNS

[Megadan]

Well... The hawk is out of commission for now.

Let my friend ride it and something happened with the rear end and caused it to kick out. Bike got lowsided. Thankfully it was only at about 5-10mph, but it slid under a truck. Front wheel alignment is off but nothing appears bent. Gotta take it apart and inspect everything. Left side plastic cover over the battery is destroyed. Handlebar is bent, and left side adjuster got tweaked a bit too. The brake lever is also bent from where it hit the underside of the truck on the frame. The IMS shifter did it's job though as far as I can tell.

Took the rear wheel off, and guess what I found. Rear sprocket is loose again. Those factory sprocket studs are worthless with the amount of play they have.

[Megadan]

Couple of pictures. Brake lever is worse than it looks in the picture.

[Weldangrind]

Originally Posted by Megadan

Well... The hawk is out of commission for now.

Let my friend ride it and something happened with the rear end and caused it to kick out. Bike got lowsided. Thankfully it was only at about 5-10mph, but it slid under a truck. Front wheel alignment is off but nothing appears bent. Gotta take it apart and inspect everything. Left side plastic cover over the battery is destroyed. Handlebar is bent, and left side adjuster got tweaked a bit too. The brake lever is also bent from where it hit the underside of the truck on the frame. The IMS shifter did it's job though as far as I can tell.

Took the rear wheel off, and guess what I found. Rear sprocket is loose again. Those factory sprocket studs are worthless with the amount of play they have.

How is your friend?

[Megadan]

The rear sprocket play now is minimal. The only reason it moves is because of those cush drive sprocket studs not being the proper size and moving in their respective holes. If they were a light press fit and not a hotdog in a hallway the sprocket wouldn't move at all.

My plan is to use Honda sprocket studs.

Clark, a quick test is to simply grab the sprocket and try to push/pull on it. As long as the chain isn't too tight, it will move even installed on the bike.

Originally Posted by Weldangrind

How is your friend?

He's fine, just a bruise on his leg. He was more concerned with the bike lol. I didn't care about the bike. That weird way that friends are lol. I already have a new panel, brake lever, and adjusters on order. Cost less than 80 bucks. I was going to change to a different style of handlebar anyway, so that doesn't bother me.

[kirbo7106]

Hey Megadan,

Tell us about this "hotdog in a hallway"?

But in the meantime, when and where are you getting the new studs? How many miles were on your Hawk when the wreck happened? Are you using the factory C-clip?

Be safe out there!

[Megadan]

Originally Posted by kirbo7106

Hey Megadan,

Tell us about this "hotdog in a hallway"?

But in the meantime, when and where are you getting the new studs? How many miles were on your Hawk when the wreck happened? Are you using the factory C-clip?

Be safe out there!

They have a gap of about a 1/16th of an inch all the way around.

New studs are three types. 71 sl350. 72 sl350, and an old XR that I dont remwmber the year. Going to test them all out and see which ones work the best. I got them off of ebay. They are NOS Honda studs. I have so many due to a seller that couldn't get my order right, so I ordered the missing ones to make complete sets. If all three types will work, I will sell the other two sets to recoup some of my cost. I should have them all no later than Friday. Factory Snap ring, and its fine.

Bike has about 250ish miles.

[Weldangrind]

Originally Posted by Megadan

My plan is to use Honda sprocket studs.

We've had this issue come up several times over the last decade, and the fix was to also install Honda bushings. IIRC, the XL185 used the same bushings, but I can't swear to it. Be careful with the XR bikes, because some of them used six bushings instead of five, and they might be a different size.